Materials 2013, 6(1), 184-197; doi:10.3390/ma6010184
Article

Nanocrystalline Akaganeite as Adsorbent for Surfactant Removal from Aqueous Solutions

1 Department of Petroleum and Natural Gas Technology, Technological Educational Institute of Kavala, Kavala 65404, Greece 2 Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
* Author to whom correspondence should be addressed.
Received: 13 November 2012; in revised form: 6 January 2013 / Accepted: 8 January 2013 / Published: 10 January 2013
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Abstract: The present study presents the effective use of nanocrystalline akaganeite for the adsorption of an anionic (SDS), a cationic (CTAB), and a nonionic (tween80) surfactant from wastewater. Equilibrium experiments, as well as thermodynamic analysis, were performed. The maximum SDS adsorption occurs at the lowest pH value (5), the opposite is observed for CTAB (pH = 11), while for tween80, the change of pH value did not affect the adsorption. The equilibrium data could be described by Freundlich and Langmuir isotherms. The maximum adsorption capacity at 25 °C (pH = 8) was 823.96 mg/g for SDS, 1007.93 mg/g for CTAB, and 699.03 mg/g for tween80. The thermodynamic parameters revealed the exothermic and spontaneity nature of the process. Also, FTIR measurements established that surfactants are adsorbed on the surface of akaganeite, replacing adsorbed water.
Keywords: akaganeite; removal; adsorption; surfactant

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MDPI and ACS Style

Kyzas, G.Z.; Peleka, E.N.; Deliyanni, E.A. Nanocrystalline Akaganeite as Adsorbent for Surfactant Removal from Aqueous Solutions. Materials 2013, 6, 184-197.

AMA Style

Kyzas GZ, Peleka EN, Deliyanni EA. Nanocrystalline Akaganeite as Adsorbent for Surfactant Removal from Aqueous Solutions. Materials. 2013; 6(1):184-197.

Chicago/Turabian Style

Kyzas, George Z.; Peleka, Efrosyni N.; Deliyanni, Eleni A. 2013. "Nanocrystalline Akaganeite as Adsorbent for Surfactant Removal from Aqueous Solutions." Materials 6, no. 1: 184-197.

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